Datasheet
SN54HCT540, SN74HCT540
OCTAL BUFFERS AND LINE DRIVERS
WITH 3-STATE OUTPUTS
SCLS008C – MARCH 1984 – REVISED MARCH 2003
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
V
CC
T
A
= 25°C SN54HCT540 SN74HCT540
UNIT
PARAMETER
TEST
CONDITIONS
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
V
OH
V
I
=V
IH
or V
IL
I
OH
= –20 µA
45V
4.4 4.499 4.4 4.4
V
V
OH
V
I
=
V
IH
or
V
IL
I
OH
= –6 mA
4
.
5
V
3.98 4.3 3.7 3.84
V
V
OL
V
I
=V
IH
or V
IL
I
OL
= 20 µA
45V
0.001 0.1 0.1 0.1
V
V
OL
V
I
=
V
IH
or
V
IL
I
OL
= 6 mA
4
.
5
V
0.17 0.26 0.4 0.33
V
I
I
V
I
= V
CC
or 0 5.5 V ±0.1 ±100 ±1000 ±1000 nA
I
OZ
V
O
= V
CC
or 0, V
I
= V
IH
or V
IL
5.5 V ±0.01 ±0.5 ±10 ±5 µA
I
CC
V
I
= V
CC
or 0, I
O
= 0 5.5 V 8 160 80 µA
∆I
CC
†
One input at 0.5 V or 2.4 V,
Other inputs at 0 or V
CC
5.5 V 1.4 2.4 3 2.9 mA
C
i
4.5 V
to 5.5 V
3 10 10 10 pF
†
This is the increase in supply current for each input that is at one of the specified TTL voltage levels rather than 0 V or V
CC
.
switching characteristics over recommended operating free-air temperature range, C
L
= 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM TO
V
CC
T
A
= 25°C SN54HCT540 SN74HCT540
UNIT
PARAMETER
(INPUT) (OUTPUT)
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
t
d
A
Y
4.5 V 13 20 30 25
ns
t
pd
A
Y
5.5 V 12 18 27 23
ns
t
OE
Y
4.5 V 20 30 45 38
ns
t
en
OE
Y
5.5 V 18 27 41 34
ns
t
di
OE
Y
4.5 V 19 30 45 38
ns
t
dis
OE
Y
5.5 V 18 27 41 34
ns
t
t
Y
4.5 V 8 12 18 15
ns
t
t
Y
5.5 V 7 11 16 14
ns
switching characteristics over recommended operating free-air temperature range, C
L
= 150 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM TO
V
CC
T
A
= 25°C SN54HCT540 SN74HCT540
UNIT
PARAMETER
(INPUT) (OUTPUT)
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
t
d
A
Y
4.5 V 20 30 45 38
ns
t
pd
A
Y
5.5 V 19 27 41 34
ns
t
OE
Y
4.5 V 26 40 60 50
ns
t
en
OE
Y
5.5 V 25 36 54 45
ns
t
t
Y
4.5 V 17 42 63 53
ns
t
t
Y
5.5 V 14 38 57 48
ns
operating characteristics, T
A
= 25°C
PARAMETER TEST CONDITIONS TYP UNIT
C
pd
Power dissipation capacitance per buffer/driver No load 35 pF